The 2019–20 Washington State Cougars men's basketball team represented Washington State University during the 2019–20 NCAA Division I men's basketball season.

The team was led by first-year head coach Kyle Smith.

The Cougars played their home games at the Beasley Coliseum in Pullman, Washington as members in the Pac-12 Conference.

On March 12, all other conference tournaments and postseason tournaments were cancelled, making the Cougars win over Colorado on March 11 the final game to be completed in the 2019–20 basketball season.

At the conclusion of the season, head coach Ernie Kent was fired.